Blowing device for rock drills



May 3, 1930.

.BA l-E BLOWING ngv cs 510a n'oqx DRILLS Filed July 19, 4927 v v INVENTOR, I

HAS AT'TRNEY.

Patented May 13, 1930 PAT r FFics LEWIS C. BAYLES, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGEBSOLL-RAND COM- PANY, F JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY BLOWING DEVICE non nocx DRILLS Application filed July 19,

This invention relates to rock drills, but more particularly to ablowing device for fluid actuated'rock drills of the hammer type.

One'ob'je'ct of the invention is to' permit the introduction of an uninterrupted volume of pressure fluid under full line pressure into the drill for removingthe cuttings therefrom whenever the usualblowing devices provided for this purpose prove inadequate. 1 a

Other objects will be in part obvious and in part pointed out hereinafter."

In the drawings "illustrating a practical embodiment of the invention, 1

Figure 1 is a longitudinal sectional elevati'on of a rock drill having the invention applied thereto and showingthe blower valve in position to admit pressure fluid into'one end of the valve chamber, 7 c

Figure 2 is aview similar to Figure 1 showing the blower valve closed,

L Figure 3 is an end view of the valve chest partly in section, and t Figure 4 is a view takenthrough Figure 3 on the line 4-4 looking in the direction indicated by the arrows. a Referring to the drawings theinvention is shown applied to a rock drill having a cylinder A in which is disposed a reciprocatory hammer piston B to deliverblows of impact to a hollow drill steel C extending into a front head Dr The piston in this instance carries at'its forward end a reduced extension or nose E, in the periphery of which are formed longitudinal flutes F which cooperate slidably'with an internally fluted chuck'mechanism designated by G for imparting rotary movement tothe drill steel C. Y

Rotary movement. of the piston is induced by rotation mechanism designated generally by H. The rotation mechanism'I-I may be of a well tends into and interlocks slidably with the piston Bi. y V

Preferably, thepiston B is provided with a passage K through which a portion ofpressurefluid' admitted to the rearward end o the cylinder may flow tothe drill steel and into th'e drill hole'for the purpose of removing the cuttings therefrom." V f 50 A' similar blowing effect is also obtained known type in which arifle bar 'Jex 1927. Serial No. 206,859.

into the chuck G and thence through the hollow drill steel C into the drill hole;

In the construction shown, a Valve chest L is disposed on the side of the cylinder A and has a bore, 0 of uniform diameter there- ,through to form a valve chamber P for the reception ofa pressure fluid distributing valveQ. The rearward and front ends of the bore 0 are sealed by plugs R and S respectively and these plugsflare bored to receive a bolt T whereby the plugs R and S are held securely in the ends of'the bore 0. The valve Q may be of a well known type having. end

heads U andV and a central head W, all of which are of the same diameter, V I

The central head W of the valve controls a port X of a supply chamber Y for intermittently admitting pressure fluid to the ends i of the cylinder vthrough inlet passages 'Z and b respectively, the inlet passages Z and bbeing so located that their inlet openings communicate with the valve chamber P between the headsV, W and U, W. The inlet passages Z and balsoserve as passages for ex hausting the fluid from the cylinder; The 89 exhaust thus passes throughthe valve chamber P, that from therearward end of the cyl- V inder passes through an exhaust'passage o'in the valve chest, and is controlled by thejhead U of the valve. A similar exhaust passage d is formed in the forward end of the valve chest for the front end of'the cylinder ,and

is controlled by the head V of the valve. v

' Pressure fluidlfor actuating the valve is conveyedin thisiinstance from the cylinder to the front and rear ends of the valve chamber P through kickerpassages e and f respectively. The kicker passages e and f are con trolled by the piston B and are so located that advantageous period in the cycle offoperaf tions of the plston. For the best operation I of the valve the kicker passages e and fare crossed and in this'instance these passages communicate I with the ends of'the yalve chamber P through ports 9 formed In the heads Uand V. The ports 9 serve both as admission and exhaust ports for the ends of i l the valve chamber so that pressure fluid admitted into :one end of the chamber P may again return into the kicker passage from s W te .itmey eseen hrhegh leek pe ts h ah ly" whimenie g with t e exh us passages c and d.

Under certain operating conditions, depending uponthe-particular kind: of-reck be:

ing drilled, the pressure fluidadmitted through the ordinary channels provided for cleansing the'drill hole may hesuflicicntto erem hthtthe-eleillete ll 1 tQLtE'FO nr-even eh Qeeue nee prevent clogging ofthe drill hole. However,

in drilling holes of a considerable depth and,

the eet in: meet dr l in QPQHLhlQQfirTrhBFfi ere im el whehthe intermi t le in from the erhhtle ehde einadeqhetete prevent he t lmeti h it when detr tue e euhd. th

ele teeladiae'eqt t e cu tihebit, nd hich ar fteh eemqu ly r ard the retery v 7 ef thie llhtlee hen itieegme he e s p e tl d -i the lzte t ihstehee-t9 eel et wve y, r dhee l hihtetr rted supply pre euh fluid int-e the dril hqlee at; su table ihte ele thus lteneee l trans erse y thr ugh ere h i a t-tu et he eve hand the. valve .7 e hihetitheeideet the rroje tieh Q for ho ili s e-velvei a ainst ehdwi mo emen in reae zie m te ziecl-hythet ent a ve chem- 'r ""A eheehd qt therva ve 2'; ie t le er 22 wher by the eh e m y be mah ru et Bh fet h me flange q eterm d a t e j to bear ehe dire tiohi' Ih rdeh te h d the va e i a ainst h me emeht h the pie site directien, acgl1ar 1: isd -isposed-onthe projectthe emit Qt the Valve fende ur d! hereto by eaneetepin i J Thehleweh elve inlth e in tan e has a qheithdihall'gree e M -su tably o a ed o esteh ieheeihmunieet en betwee p s g iathee ue eiwhiehleee e tethe forward end ef the alvle ehamhe l n a pa age l it et em th ehppl ehember Y h th bore hehita lemeahe may h p vid d. fer tihe the deg etreteti nefthe hl r Whe led 9: hol ea d ewer val e in its? Ql i td audi -tree :pes t qhs T e means lel h leditori th s ernese i thepree nt .vril a.

Kin pne sed' plu ger 00 ahd' adaptedt ngage t1 'depxeee ehe.ei hethe- Ptl'zlllh:

stitahha Sn ke eral, ettih-eee hi the valye it Su h: d presteweleiQh -mey he o ehsi jerahle depth so. that t'eireeteewellemee age the' p unger te t at ee thevalt i and? the. depr siehe41max A etedhv he Sh HllQ KQQYQ e thr tgh fil -hall? f-the plehgerfamay The operation of the device is as follows:

Ordinarily with the blower valve j in the position shown in Figure 2, the valve Q, and the piston B will function in their normal manner, and a portion of the pressure fluid edmi ed t r ugh e ren in et r e e Z atmosphere.

sim a equ ce 0. vents wi l oc dh ihe; th f erward s re e et" the pis on, in wh ch ease t e Preeetue fluid is exha s ed throuehthe nle pae egeb b tween-th hea and U and threugh the ea ard exhaus nae aee et the tmo phere- "During What may he' eIme th erma epe atienef he drill, a par-h n. of th pres- Sure fluid. t rmlgh the flutes and thh ughthe ehuek G and th drill: 6 into t e drill hole to blow the cuttings therefrom on eaehirearwand strhkee the piston, 011 the forward strokeofthe piston B a POBtiQn of thepr esur flu d; adm tte i to-th rearwa end-of, th hy nder l fle alo g h rifle her J, thheueh he paeeage K,. he huck G the ee ihte the d illflhe ethr ugh he drill steel, thus also causing acertainblowing efifeet Wh le he; wardly. l

Usually whi e he'deilli hol 1e. tempe tively shallow, or whendrilling rock ofhrdinary hardness, the putts Q13 ip e e refluid a mi ted ihte he dr ll. hele upen eaeh stroke of the piston are adequate. for; maintaining n asenahly' tam-table en liti ns he. dr l halet'hew v'ersan a eumulatien of. out t ngsshould eeuh thereinzt anex ent whieh wofild: net yield to theee in ermitt nt pufie at pressure fluid, the. h ewer alve jmay he ripened. to an. extreme andp ssure flu d. will. hehhe admit ed, d rectly tr m'the supplychamber Y hreugh thefnassag s W end h ahd thegroere i to he front. ndof heavalvefc amher P ta aetagains he valve Q and held; eaidi v lve im hevahle in the rearward en efthe-valv ch m er, With the valve@ in; this pas tien, the frloht inlet passage, will? he. in direet: communication w th the. supph; chamber hat. e' etant .flhw i vre'ehu fe fimdmay ease into. the-fro t end Qtit. eeylmdl' r toheldi the p stm B movable in the rearward end of" he cylinder, Pressure. fluid may heaflowf ehithe tren riet h B s tr yelling; f

ehdi flthe e .lin er threugh the fl t s? into.

te a

rotated to its closed position and the reciprocatory elements of the drill may again function in their normal manner.

As will be observed, when the piston B is in its extreme rearward position during the blowing operation, the kicker passage 7 will be uncovered so that pressure fluid may also pass into the rearward end of the valve chamber P. Such pressure fluid however, will be 10 'of lower Value than line pressure since the said kicker passage 9 is in constant communication with the atmosphere through the rearward leak port It, the valve chamber P and the exhaust port 0. a I claim:

In a fluid actuated rock drill, the combination of a cylinder, a piston in the cylinder having a forward fluted extension, a valve chest for the cylinder having a valve chamo ber and a pressure fluid supply chamber,

' plugs forming closures for the ends of the valve chamber, inlet passages leading from the valve chamber to the ends of the cylinder, a distributing valve in the valve chamber controllingcommunication between the supply chamber and the inlet passages, a passage leading from the supply passage through the valve chest and the front plug to the front end of the valve chamber, and a blower valve disposed transversely through the front plug controlling said passage, said blower valve being rotatable to admit pressure fluid into the front end of the valve chamber to hold the distributing valve immovable in the rear end of the valve chamber and permit a constant flow of pressure fluid from the supply chamber to the front end of the cylinder thence along the fluted extension into a drill steel.

4e In testimony whereof I have signed this specification.

. LEWIS C. BAYLES. 

